| 摘要 |
PURPOSE:To accomplish prompt activation of an O2-sensor in a longitudinal V-type engine having a catalyst in a muffler, by disposing a right and a left pipes in an exhaust chamber in which a front and a rear exhaust pipes are opened, in the manner that they are located on the opposite sides of an O2-sensor disposed in said exhaust chamber. CONSTITUTION:In a structure for inserting and connecting front exhaust pipes 14a, 14b and rear exhaust pipes 16a, 16b connected respectively to two front cylinders and two rear cylinders of a longitudinal V-type four-cylinder engine to front and upper portions of an exhaust chamber 15, an O2-sensor 17 is attached substantially to the center of the chamber 15 in the direction of its width. In more detail, the sensor 17 is fixed to the chamber 15 from above at the positions thereof located slightly rearwards of the portions where the rear exhaust pipes 16a, 16b are fixed. Further, sub-pipes (connecting tubes) 18a, 18b are disposed in the exhaust chamber 15 in the manner that they are located on the opposite sides of a monitoring top 17a of the O2-sensor 17. Here, one open ends of the pipes 18a, 18b are located at positions facing the monitoring top 17a of the sensor 17 while the other open ends of the pipes 18a, 18b are located near the open ends of the exhaust pipes 14a, 14b, 16a, 16b. |
